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United States Patent | 5,502,739 |
Kidoguchi ,   et al. | March 26, 1996 |
A semiconductor laser device having an active layer, a pair of cladding layers interposing the active layer and a multi-quantum barrier provided between one of the pair of cladding layers and the active layer is provided. The multi-quantum barrier includes barrier layers and well layers being alternated with each other. Thickness, energy band gap, or impurity concentration of at least one of the barrier layers and well layers in the multi-quantum barrier changes with the distance from the active layer, thereby providing a stable function of reflecting carriers overflowing from the active layer back to the active layer.
Inventors: | Kidoguchi; Isao (Mino, JP); Ohnaka; Kiyoshi (Moriguchi, JP); Adachi; Hideto (Mino, JP); Kamiyama; Satoshi (Sanda, JP); Mannou; Masaya (Hirakata, JP); Uenoyama; Takeshi (Kyoto, JP) |
Assignee: | Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Appl. No.: | 396506 |
Filed: | March 1, 1995 |
Apr 05, 1993[JP] | 5-77845 | |
Apr 05, 1993[JP] | 5-77854 | |
Jul 28, 1993[JP] | 5-186022 | |
Aug 06, 1993[JP] | 5-195859 |
Current U.S. Class: | 372/45.01; 372/46.01 |
Intern'l Class: | H01S 003/19 |
Field of Search: | 372/45,46 |
4794611 | Dec., 1988 | Hara et al. | 372/45. |
4839899 | Jun., 1989 | Burnham et al. | 372/45. |
4999844 | Mar., 1991 | Imamoto. | |
5272712 | Dec., 1993 | Arimoto et al. | 372/45. |
5362974 | Nov., 1994 | Irikawa et al. | 372/45. |
Foreign Patent Documents | |||
4-218994 | Aug., 1992 | JP. | |
4-273491 | Sep., 1992 | JP. | |
5-3367 | Jan., 1993 | JP. | |
5-175605 | Jul., 1993 | JP. |
T. Takagi, et al., "Potential Barrier Height Analysis of AlGaInP Multi-Quantum Barrier (MQB)", Japanese Journal of Applied Physics, vol. 29, No. 11, pp. L 1977-L 1980 (Nov. 1990). T. Takagi et al., "Design and Photoluminescence Study on a Multiquantum Barrier", IEEE Journal of Quantum Electronics, vol. 27, No. 6, pp. 1511-1519 (Jun. 1991). T. Takagi et al., "Photoluminescence Study of Electron Wave Confinement in Multi-Quantum Barrier (MQB)", Japanese Journal of Applied Physics, vol. 29, No. 11, pp. L 1969-L 1972 (Nov. 1990). |